4a-16=7a-21

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Solution for 4a-16=7a-21 equation: 



4a-16=7a-21

We move all terms to the left:

4a-16-(7a-21)=0

We get rid of parentheses

4a-7a+21-16=0

We add all the numbers together, and all the variables

-3a+5=0

We move all terms containing a to the left, all other terms to the right

-3a=-5

a=-5/-3

a=1+2/3

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